fix: invalid table name

In my last commit, i converted mysql table names to uppercase in
gps.php.
I was wrong, because on unicode database table names and colums is case
sensivity.
Example: GPSLOG != gpslog.
added Log4php

Log4php added to project
add: Log4php implementation and code reading improvement

In the log file is saved errors while accessing the database
Warn level = FATAL
config file = config.xml